RU2244870C2 - Light-emitting diode lamp - Google Patents

Abstract

FIELD: instrumentation engineering; light signal devices for all-round view.

SUBSTANCE: part of light-emitting diodes of proposed lamp is located in units of polar coordinate grid or on sides and vertex of regular polygonal coordinate grid. Some light-emitting diodes are oriented in different planes of optical axis of radiation and are mechanically locked on plate at required spatial orientation.

EFFECT: enhanced light and thermal properties; simplified construction.

5 cl, 4 dwg

Description

The present invention relates to lighting engineering, in particular to light sources - optical units or lamps based on semiconductor light emitting diodes that generate optical radiation of red, green, yellow, blue, infrared radiation or white light.

Such lamps are intended for use in light-signaling devices, for example, in obstruction lights, in explosion-proof lamps, in lighting devices, light beacons, in light marking lights of airfields and heliports.

Known lamp (1) on LEDs, containing groups of LEDs equidistant from its longitudinal axis, assembled on a holder in the form of a convex polyhedron, consisting of a set of coaxially mounted polyhedral rings equipped with grooves whose walls are made at an angle equal to the angle of inclination of the LED leads installed in them .

The disadvantages of the analogue are due to the complexity of the design, increased dimensions, the effectiveness of the application mainly in the layout with high-power LEDs that require efficient heat removal due to conductive heat transfer.

A known light source using LEDs used in a signal optical device (2), made in the form of a flat printed circuit board with the leads of LEDs soldered on it, located on concentric circles (at nodes of the polar coordinate grid) or at the vertices and centers of polygons. To fix a given position along the optical axis of the device, the LEDs were placed in the holes of a metal mask made of heat-conducting material.

The proposed light source is effective for use in traffic lights, where the LEDs are mounted perpendicular to the board, and their optical axes are parallel to each other.

Thus, the disadvantages of the prototype are associated with the difficulties of accurate spatial orientation and fixing the position of the LEDs located at different angles of inclination of their optical axes to a flat board.

This makes it difficult to obtain a uniform light distribution of the light source in the hemisphere, which is important, for example, when creating barrage lights or lighting fixtures.

The aim of the invention is to improve the lighting and thermophysical parameters, increasing the uniformity of light distribution while simplifying the design of the lamp on the LEDs.

This goal is achieved by the fact that in the LED lamp containing a board on which the leads of the LEDs are soldered, at least some of which are located at the nodes of the polar coordinate grid or on the sides and at the top of the regular polygonal coordinate grid, as well as the mains converter and the board holder with means of current supply, the terminals of at least part of the LEDs are bent in the meridional planes passing through the longitudinal axis of symmetry of the lamp at selected angles ranging from 0 to 90 °, corresponding to E direction of the optical axis of each LED and is mechanically fixed on the board with the selected spatial orientations.

The goal is achieved by the fact that the curved terminals of the LEDs are mechanically fixed on the board by an electrical insulating compound, preferably a ceramic-polymer heat-conducting dielectric compound.

The problem is also solved by the fact that on the printed circuit board along the lines of the polar coordinate grid, concentric protrusions with conical walls with a triangular profile are made, along the generatrices of which the curved LED leads are mounted and adjoin them.

Finally, the achievement of the goal is also facilitated by the fact that on the back side of the insulating board there are installed electronic elements of the power supply converter with current-carrying means.

Preferred embodiments of the device according to the invention are shown in the drawings.

Figure 1. LED lamp, profile section.

Figure 2. The same as in figure 1, a top view.

figure 3. The lamp on the LEDs oriented in space on the concentric protrusions of the board, profile section.

Figure 4. The same as in figure 3, a top view.

The LED lamp shown in Figs. 1 and 2 contains a flat round printed circuit board 1, on which the leads 2 of the LEDs 3 are soldered. LEDs 3 with optical axes OO, O ₁ , O ₃ and O _{4 are} installed in nodes of the polar coordinate grid (shown by a dotted line, see figure 2). The conclusions of 2 LEDs (except for the mounted LED on the OO axis) are bent in the meridional planes (radial dashed lines) passing through the longitudinal axis of symmetry of the OO lamp at selected angles ranging from 0 to 90 °. Their parts emerging from the housing of each LED 3 are oriented in parallel and correspond to the directions of the optical axes O ₁ , O ₂ , O ₃ and O _{4 of} each of them.

In addition, the bent terminals 2 of the LEDs 3 are mechanically fixed on the printed circuit board 1 with the selected spatial orientation of the optical axis using the electrical insulating compound 4 and are held thereon by the specified compound and soldering of the ends 5 on the back side of the board.

For the mechanical fixation of leads 2 on the board, it is preferable to use a ceramic-polymer heat-conducting dielectric compound having high adhesion to them and thermal conductivity, which improves the thermophysical parameters of the lamp.

The inclination angles of the optical axes OO, O _1, O _2, O ₃ and O ₄ to the horizontal for LEDs with a scattering angle 2Θ _0,5 of the maximum intensity within 5-7 kd chosen equal to 90 °, 45 °, 65 °, 85 and 0 °, respectively, which provides a spatial distribution of light intensity in the upper hemisphere with increased light intensity at angles from -6 ° to + 6 °. Such light distribution is regulated for obstructive circular lights.

On the back side of the printed circuit board 3, electronic elements of the converter 6 of the power supply are installed, protected by the holder 7 of the board, with current supply means 8. The holder 7 is mounted on the bracket 9 for mounting the lamp in the light fixture.

The holder 7 can be paired with a standard international base E 27 or Gy 9.5 (not shown).

The second version of the lamp with LEDs (see Figs. 3 and 4) provides for the execution of a board 10 with a relief on which the LEDs 3 are wired, i.e. so that concentric ledges 11 with conical walls 12 with a triangular profile are made along the grid lines.

On the generators of the protrusions 11 of a conical shape, the curved leads 13 of the LEDs are installed and adjoin them. Thus, the required tilt of the optical axes of the LEDs is determined by the angle of inclination of the generatrix of the conical surface of each protrusion 11, on which the leads 13 exiting from the housing of each LED 3 are mounted, bent near the mounting hole in the board 10.

Conclusions 13 on the embossed surface of the board 10 are coated with a mounting varnish or electrical insulating compound, ensuring their mechanical fixation.

This version of the board increases the accuracy of installation and the required orientation of the LEDs in space.

Installing the board 10 on the divider 7, pairing it with the power supply converter and the lamp mounting means in the light device are similar to those described above for the first embodiment.

Boards 1 and 10 can be made in the form of regular polygons, the number of sides of which corresponds to the number of LEDs 3 mounted on the periphery with optical axes O ₄ (not shown).

In this case, the LEDs are placed on the sides and at the apex of the regular polygonal grid.

The advantages of the proposed design of a flat lamp on LEDs are to improve lighting parameters by increasing the uniformity of light distribution while simplifying the design and technology of lamp assembly.

In addition, the thermophysical parameters of the lamp are improved due to the contact of the heat-transmitting leads and the LED housings with the heat-conducting compound and the board.

Literature

1. A lamp on light-emitting diodes. Pat. RF №2158876, class F 21 S 8/10. Publ. 11/10/2000, Bull. 31.

2. Signal optical device. Certificate on the floor. RF model No. 0004801, class F 21 Q 3/00. Publ. 08/16/97.

Claims (4)

1. A LED lamp, comprising a board on which the leads of the LEDs are soldered, at least some of which are located at the nodes of the polar coordinate grid or on the sides and top of the regular polygonal coordinate grid, as well as a power supply converter and a board holder with current supply means, characterized the fact that the conclusions of at least part of the LEDs are bent in the meridional planes passing through the longitudinal axis of symmetry of the lamp at selected angles ranging from 0 to 90 °, corresponding to the direction of op axis of each LED, and mechanically fixed on the board with the selected spatial orientation. 2. The LED lamp according to claim 1, characterized in that the curved terminals of the LEDs are mechanically fixed on the printed circuit board by an electrical insulating compound, preferably a ceramic-polymer heat-conducting dielectric compound. 3. The lamp on the LEDs according to any one of claims 1 and 2, characterized in that along the lines of the polar coordinate grid there are made concentric protrusions with conical walls with a triangular profile, along the generatrices of which the curved LED leads are mounted and adjoin them. 4. The LED lamp according to any one of claims 1 to 3, characterized in that on the rear side of the printed circuit board there are electronic elements of the power supply converter and a board holder with current supply means.

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